Lingo建模语言与实例4

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目标与约束段
' r7 q1 C+ O+ [集合段（SETS    ENDSETS）
6 c. w' x0 @( D数据段（DATA   ENDDATA）
初始段（INIT  ENDINIT）
（计算段 (CALC ENDCALC)）
MODEL:
: I/ n5 J1 L: Q4 M/ I  }Title Location Problem;
sets:
    demand/1..6/:a,b,d;
    supply/1..2/:x,y,e;
    link(demand,supply):c;
endsets
* W0 u# A: k; {' C/ `! ^data:
: w% J: n2 u: n1 B; Ga=1.25,8.75,0.5,5.75,3,7.25;
b=1.25,0.75,4.75,5,6.5,7.75;
d=3,5,4,7,6,11; e=20,20;
& d) w  B* j; B2 z% ?8 P9 yenddata
1 y  A5 c$ ?$ ~" l. Vinit:
* N& k) S8 n& {) b( J4 q6 g/ Jx,y=5,1,2,7;
) b5 M6 A: w' A! C5 w5 Zendinit
- z% y: Q' Z! ?/ m7 Nmin=@sum(link(i,j):c(i,j)*((x(j)-a(i))^2+(y(j)-b(i))^2)^(1/2));
$ r" X0 W% `+ A* Z/ X@for(demand(i)sum(supply(j):c(i,j))=d(i););
2 w3 D. P/ N/ z4 N  `7 R3 s@for(supply(i)sum(demand(j):c(j,i))<=e(i););
END

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